CN104154703A - Frequency control method for a variable frequency refrigerator - Google Patents
Frequency control method for a variable frequency refrigerator Download PDFInfo
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- CN104154703A CN104154703A CN201410349572.0A CN201410349572A CN104154703A CN 104154703 A CN104154703 A CN 104154703A CN 201410349572 A CN201410349572 A CN 201410349572A CN 104154703 A CN104154703 A CN 104154703A
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Abstract
The invention relates to the technical field of refrigerators, in particular to a frequency control method for a variable frequency refrigerator. The frequency control method includes the steps: S1, a variable frequency compressor runs under a set frequency and stops after running for a set on time T; S2, the variable frequency compressor waits for a set off time K and starts; S3, an on-rate, N=T/(T+K), is set; S4, after running for an actual on time t, the variable frequency compressor stops, and after waiting for an actual off time k, the variable frequency compressor starts, and an actual on-rate, n=t/(t+k), is set; S5, comparison on the set on-rate N and the actual on-rate n is made, if the actual on-rate n is smaller than the set on-rate N, the variable frequency compressor runs under a lower frequency next time, and the variable frequency compressor is at a lower speed; if the actual on-rate n is larger than the set on-rate N, the fact that the variable frequency compressor is poor in refrigerating capacity is judged, the variable frequency compressor runs under the higher frequency next time, and the variable frequency compressor is at a higher speed.
Description
Technical field
The present invention relates to the technical field of refrigerator, more specifically, relate to the control method for frequency of frequency conversion refrigerator.
Background technology
Due to energy-conservation requirement, the application of frequency conversion refrigerator is more and more at present, and utilizing the energy-conservation of frequency conversion refrigerator is mainly to utilize compressor refrigerating capacity under low-frequency state little, and the efficiency change of compressor is little.When the refrigerating capacity hour of compressor, because the refrigeration systems such as evaporimeter do not change, occur that evaporating temperature rises, condensation temperature reduces, thereby compressor is improved at the refrigerating efficiency of actual time, and refrigerator occurs energy-conservation.When the thermic load that needs at refrigerator is larger, compressor can adopt higher frequency to improve the rotating speed of motor, thereby occurs that the refrigerating capacity of compressor is large, adapts to the demand of hot environment or high heat load.But for the frequency of frequency-changeable compressor, selecting is at present mainly to survey the present practical service environment temperature of refrigerator by design environment temperature-sensitive head, utilize environment temperature tentatively to confirm the running frequency of compressor, also considered the variation of design temperature simultaneously, when as larger in the temperature difference in design temperature and refrigerator compartment, also can adopt different frequencies, or special functional requirement, as quick-frozen, cold, the ice making of speed etc., compressor also can be selected higher frequency operation.In the design of control panel, by the various requirements to frequency, judge, output signal to the frequency conversion plate of compressor, instruct compressor to adopt corresponding running frequency.The selection of above-mentioned this frequency is all to design program givenly in advance, for complicated changing environment, comprises that environment for use may be because inconsiderate and occur incomplete energy-conservation.
The frequency change of current frequency conversion refrigerator is to be all subject to environment temperature, design temperature, set-up function, or the laggard line frequency of the defrost that is judged to be frost-free refrigerator changes, during as environment temperature step-down, the thermic load of refrigerator is little, the refrigerating capacity that compressor requires is little, can be by turning down after the frequency of compressor, reduce the motor speed of compressor, thereby provide the frequency of less refrigerating capacity, when environment temperature raises, the thermic load that refrigerator requires is large, require the refrigerating capacity of compressor large, by master control borad, send signal to frequency conversion plate, improve the frequency of motor, compressor is run up, larger refrigerating capacity is provided.When if design temperature and actual temperature difference are larger, illustrate that the cold of refrigerator requirement is more, also can to frequency conversion plate, send signal by master control borad, require high rotary speed operation.Equally, for some special functional requirements, as cold in speed, speed is frozen after order sends, and also can require high rotating speed operation to compressor, and after the defrost of frost-free refrigerator, operation for the first time all can be carried out high-frequency operation.The variation of these frequencies is all due to the command request that has other, frequency conversion plate is sent to the order of frequency change, thereby produces different frequencies, and the refrigerating capacity of frequency-changeable compressor is changed, and adapts to the requirement of these instructions, reaches the object of design.It is all to design in advance that the variation of these frequencies requires, if the actual environment of refrigerator is not in the scope of design, the running status of compressor may not be best, and many energy-conservation be all for a certain special Environment Design, do not accomplish the energy-conservation object under loopful border.
Summary of the invention
The present invention is at least one defect overcoming described in above-mentioned prior art, the control method for frequency of frequency conversion refrigerator is provided, by the frequency of compressor operating is carried out after sampling analysis, automatically adjust the frequency of compressor, to guarantee that compressor is all operated within the scope of certain operation ratio of design under various environment, and do not consider the residing environment temperature of refrigerator, the real use state of refrigerator, the defrost of the design temperature of refrigerator, refrigerator whether state and special function command etc.This Frequency refrigerator has not been only applicable to programme controlled computer refrigerator, is applicable to the mechanical type frequency conversion refrigerator of mechanical temperature-control yet.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
The control method for frequency of frequency conversion refrigerator, wherein, comprises the following steps:
S1. frequency-changeable compressor is according to the frequency operation of setting, and after available machine time T is set in frequency-changeable compressor operation, frequency-changeable compressor is shut down;
S2. frequency-changeable compressor is set and after K, is started shooting in wait downtime;
S3. frequency conversion plate calculates setting Homes Using TV N, sets Homes Using TV N=T/T+K;
S4. frequency-changeable compressor actual motion, frequency-changeable compressor shutdown after the actual available machine time t of frequency-changeable compressor operation; Frequency-changeable compressor is started shooting after k in wait actual downtime, and frequency conversion plate calculates actual Homes Using TV n, actual Homes Using TV n=t/t+k;
S5. set Homes Using TV N and actual Homes Using TV n comparison, if actual Homes Using TV n is less than, set Homes Using TV N, frequency-changeable compressor reduces running frequency next time, reduces the rotating speed of frequency-changeable compressor;
If actual Homes Using TV n is greater than, set Homes Using TV N, the refrigerating capacity that is judged to be frequency-changeable compressor is not enough, in the running frequency of the raising frequency-changeable compressor in service of upper once frequency-changeable compressor, improves the rotating speed of frequency-changeable compressor.
In the present invention, above-mentioned word meaning: set available machine time T, set K downtime, set Homes Using TV N=T/T+K, actual available machine time t, actual downtime k, actual Homes Using TV n=t/t+k.
In the present invention, in the process of refrigerastion of refrigerator, there is different frequency state operations in running frequency---freezer compressor, the corresponding compressor of this running frequency has different motor speeds according to different demands, it can be that continuity changes, and can be also that discontinuous changes.
Operation ratio----refer to refrigerator start and the time ratio of shutting down, also with regard to boot running time the occupy total time ratio of (available machine time and downtime summation).
Further, in described step S5, if the temperature of a chamber has reached the requirement of design temperature, frequency-changeable compressor is shut down.
Optionally, in described step S5, frequency-changeable compressor runs to forced stoppage after the longest setting K downtime.Described setting K downtime is by the program setting of frequency-changeable compressor.
Further, wait for that the temperature in refrigerator arrives the requirement of design temperature, frequency-changeable compressor is waited for setting and after K, is started shooting again downtime.
Further, described setting K downtime is by the program setting of frequency-changeable compressor.
Concrete; frequency-changeable compressor is first according to a certain frequency operation, and as initial designs frequency, the requirement that can start according to reality is selected; then compressor operating regular hour; this time is likely the temperature control requirement in refrigerator, and as refrigeration and the temperature of refrigerating chamber have all reached the requirement designing, compressor must be shut down; also be likely the middle maximum duration of stipulating a compressor operating of designing program; after half an hour, mandatory shutdown, then waits for compressor start.This start is mainly to carry out requirement by the temperature controller in refrigerator; if being the temperature in refrigerator, the shutdown of compressor carries out after reaching requirement; can automatically wait for after the temperature rising in refrigerator; reach the turn-on temperature of temperature controller requirement; if mandatory shutdown, be that guard time by program or compressor oneself determines the downtime of compressor.By above-mentioned start and downtime, can be by frequency conversion plate to calculating the running time of compressor, if the operation ratio of compressor is less than some values or scope, compressor can reduce the frequency of operation next time, reduce the rotating speed of compressor, thereby reduction refrigerating capacity, improve the operation ratio of compressor, if the compressor operating rate after calculating is higher than a certain value or scope, the refrigerating capacity that is judged to be compressor is not enough, running frequency at the raising compressor in service of upper once compressor, improve the rotating speed of compressor, thereby improve the refrigerating capacity of compressor, reduce operation ratio, the operation ratio that guarantees compressor is worked always within the scope of the operation ratio of some designs, if operation ratio is 70～80%, the running status of refrigerator meets the energy-conservation requirement of refrigeration system with less refrigerating capacity all the time like this, and do not consider refrigerator is worked under what environment temperature, do not need master control borad frequency conversion plate to be provided to the semaphore request of frequency change yet.
In the actual use of refrigerator, when environment temperature raises, if the frequency of compressor does not change, operation ratio can become greatly, illustrates that the refrigerating capacity that refrigerator requires is strengthening, such state is for the design temperature of having turned down suddenly refrigerator compartment, it is identical starting speed function cold, quick-frozen, for the defrost of frost-free refrigerator, after defrost completes, the refrigerating capacity needing also can strengthen, and by operation ratio, judges.
By this mode by operation ratio, adjust the frequency of frequency conversion refrigerator; be mainly manifested between master control borad and frequency conversion plate and do not need communication protocol; just the temperature in refrigerator reaches the power supply that cuts off frequency-changeable compressor after requirement; realize dead halt; so the present invention has not only been applicable to programme controlled computer refrigerator, applicable equally for the refrigerator of mechanical temperature-control.
Compared with prior art, beneficial effect is: the present invention can carry out the running frequency of active accommodation refrigerator fairly simplely by operation ratio, thereby initiatively adapts to the variation requirement of the use state of refrigerator.Frequency conversion refrigerator control method provided by the invention, also the refrigerator for mechanical temperature-control provides the technical feasibility that adopts frequency-changeable compressor.The present invention adopts the frequency conversion refrigerator of this technology to remain the energy-conservation optimum state of refrigerator, and less refrigerating capacity is all provided under various environment as far as possible, improves evaporating temperature, reaches the energy-saving effect under loopful border.
Accompanying drawing explanation
Fig. 1 is temporal power schematic diagram of the present invention.
Fig. 2 is syndeton schematic diagram of the present invention.
The specific embodiment
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent; For better explanation the present embodiment, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product; To those skilled in the art, in accompanying drawing some known configurations and explanation thereof may to omit be understandable.In accompanying drawing, describe position relationship only for exemplary illustration, can not be interpreted as the restriction to this patent.
As shown in Figure 1, 2, the control method for frequency of frequency conversion refrigerator, wherein, comprises the following steps:
S1. frequency-changeable compressor 1 is according to the frequency operation of setting, and after available machine time T is set in frequency-changeable compressor 1 operation, frequency-changeable compressor 1 is shut down;
S2. frequency-changeable compressor 1 is set and after K, is started shooting in wait downtime;
S3. 2 pairs of frequency conversion plates are set Homes Using TV N calculating, set Homes Using TV N=T/T+K;
S4. frequency-changeable compressor 1 actual motion, frequency-changeable compressor 1 shutdown after the actual available machine time t of frequency-changeable compressor 1 operation; Frequency-changeable compressor 1 is started shooting after k in wait actual downtime, and 2 couples of actual Homes Using TV n of frequency conversion plate calculate, actual Homes Using TV n=t/t+k;
S5. set Homes Using TV N and actual Homes Using TV n comparison, if actual Homes Using TV n is less than, set Homes Using TV N, frequency-changeable compressor 1 reduces running frequency next time, reduces the rotating speed of frequency-changeable compressor 1;
If actual Homes Using TV n is greater than, set Homes Using TV N, the refrigerating capacity that is judged to be frequency-changeable compressor 1 is not enough, in the running frequency of the raising frequency-changeable compressor 1 in service of upper once frequency-changeable compressor 1, improves the rotating speed of frequency-changeable compressor 1.
In the present embodiment, above-mentioned word meaning: set available machine time T, set K downtime, set Homes Using TV N=T/T+K, actual available machine time t, actual downtime k, actual Homes Using TV n=t/t+k.
In the present invention, in the process of refrigerastion of refrigerator, there is different frequency state operations in running frequency---freezer compressor, the corresponding compressor of this running frequency has different motor speeds according to different demands, it can be that continuity changes, and can be also that discontinuous changes.
Operation ratio----refer to refrigerator start and the time ratio of shutting down, also with regard to boot running time the occupy total time ratio of (available machine time and downtime summation).
Further, in described step S5, if the temperature of a chamber has reached the requirement of design temperature, frequency-changeable compressor 1 is shut down.
Optionally, in described step S5, frequency-changeable compressor 1 runs to forced stoppage after the longest setting K downtime.
Further, wait for that the temperature in refrigerator arrives the requirement of design temperature, frequency-changeable compressor 1 is waited for setting and after K, is started shooting again downtime.
Described setting K downtime is by the program setting of frequency-changeable compressor 1.
Concrete; frequency-changeable compressor is first according to a certain frequency operation, and as initial designs frequency, the requirement that can start according to reality is selected; then compressor operating regular hour; this time is likely the temperature control requirement in refrigerator, and as refrigeration and the temperature of refrigerating chamber have all reached the requirement designing, compressor must be shut down; also be likely the middle maximum duration of stipulating a compressor operating of designing program; after half an hour, mandatory shutdown, then waits for compressor start.This start is mainly to carry out requirement by the temperature controller in refrigerator; if being the temperature in refrigerator, the shutdown of compressor carries out after reaching requirement; can automatically wait for after the temperature rising in refrigerator; reach the turn-on temperature of temperature controller requirement; if mandatory shutdown, be that guard time by program or compressor oneself determines the downtime of compressor.By above-mentioned start and downtime, can be by frequency conversion plate to calculating the running time of compressor, if the operation ratio of compressor is less than some values or scope, compressor can reduce the frequency of operation next time, reduce the rotating speed of compressor, thereby reduction refrigerating capacity, improve the operation ratio of compressor, if the compressor operating rate after calculating is higher than a certain value or scope, the refrigerating capacity that is judged to be compressor is not enough, running frequency at the raising compressor in service of upper once compressor, improve the rotating speed of compressor, thereby improve the refrigerating capacity of compressor, reduce operation ratio, the operation ratio that guarantees compressor is worked always within the scope of the operation ratio of some designs, if operation ratio is 70～80%, the running status of refrigerator meets the energy-conservation requirement of refrigeration system with less refrigerating capacity all the time like this, and do not consider refrigerator is worked under what environment temperature, do not need master control borad frequency conversion plate to be provided to the semaphore request of frequency change yet.
For the present invention, current invention mode is many all to be controlled and is required frequency-changeable compressor to send the instruction that frequency change requires by environment temperature-sensitive head or command function, as when environment temperature changes, environment temperature-sensitive head meeting perception information, after the data in these data and control panel programming are analyzed, determine frequency-changeable compressor should in running frequency, if the frequency of operation and the frequency of requirement are inconsistent now, the motor speed of compressor adjusted the frequency by new by frequency conversion plate, thereby the refrigerating capacity meeting design requirement is provided.These inventions all need to adopt environment temperature-sensitive head, the variation that environment temperature is described is larger on the load variations impact of refrigerator, need to directly send control signal by temperature-sensitive head, also have in addition the specific function order of refrigerator, as quick-frozen etc. needs high-frequency or the high-revolving requirement of motor etc.
The present invention considers from the angle of refrigerator energy-saving; turn down the refrigerating capacity of compressor as far as possible; but guarantee the ratio of start and the shutdown of refrigerator, so the present invention adjusts the running frequency of compressor by controlling the start of frequency conversion refrigerator compressor and the operation ratio of shutdown.The size of operation ratio is to determine by designing, as the operation ratio of controlling compressor is between 70 ~ 80%, like this no matter the residing environment temperature of refrigerator how, the state of use is how, special control command how, is all to adapt to these variations by controlling the operation ratio of compressor.In Fig. 1; can find out: T1, T3, T5, T6 are respectively the running time of compressor; T2, T4, T7 are respectively the time of compressor shutdown; P1, P2, P3, P4 are respectively the compressor horsepower of frequency-changeable compressor 1 under different frequency; the power that frequency is high is large, the defrost power that H1 is frost-free refrigerator.When compressor moves by the respective frequencies of P1, running time is while reaching T1, temperature in refrigerator has reached requirement, control panel 3 sends signal or directly stops the power supply of compressor, compressor shutdown, the time of shutting down is T2, now refrigerator requires start, in this start, calculate operation ratio, its computing formula is: n1=T1/ (T1+T2), if the n1 result of calculating is less than the operation ratio of designing requirement, compressor carries out frequency and reduces operation, corresponding compressor horsepower is P2, now compressor is used the time of less Power operation T3, reached the requirement of shutting down, then shut down after the time of T4, the temperature of refrigerator rises to the requirement of start, now recalculate new Homes Using TV n2, n2=T3/ (T3+T4), also be likely n2=(T1+T3)/(T1+T2+T3+T4), the new n2 calculating contrasts with the operation ratio of designing requirement again, determine whether to adjust the frequency of frequency-changeable compressor 1, if n2 is still less than the operation ratio of designing requirement, the power P 3 that compressor can be corresponding with lower frequency is moved.Otherwise, improve frequency operation.For frost-free refrigerator, refrigerator can have the process of a defrost within the regular hour, as the power showing is H1, can adopt official hour to limit, if T6 is the longest run time under certain frequency of regulation, if the time of operation reaches T6 under this frequency, first force to stop the operation of compressor, likely now the temperature in refrigerator does not originally reach the requirement of shutdown, so also require compressor operating refrigeration always, but compressor or frequency conversion plate 2 all can be designed with T7 downtime of compressor protection, if started at this moment, illustrate that operation ratio is higher than the requirement of design, also can calculate operation ratio by the time of T6 and T7, compressor can be heightened the frequency of operation, the power of corresponding compressor is higher P4.
Due to less demanding to master control borad of the present invention; do not need to understand the more environmental information of refrigerator; so the refrigerator for mechanical temperature-control also can be adopted in this way; if 3 in Fig. 2 can be also temperature controller, replace control panel, by temperature controller, experience the variations in temperature in refrigerator; after the requirement that whether reaches start and shut down; control frequency conversion plate 2 power supplys of frequency-changeable compressor 1, thereby control start and the shutdown of compressor, the plate of frequency conversion simultaneously 2 also has start and the stopping function of controlling compressor.And the selection of the frequency change of compressor is to select by the operation ratio of compressor equally.
The present invention avoids the front judgement of the refrigeration requirement under various use states to refrigerator of exploitation, by utilizing the operation ratio of compressor initiatively to carry out in real time frequency or cold, adjust, simplify the designing requirement of product, also for mechanical temperature control refrigerator adopts frequency-changeable compressor 1, provide technical scheme simultaneously.
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments.All any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in the protection domain of the claims in the present invention.
Claims (5)
1. the control method for frequency of frequency conversion refrigerator, is characterized in that, comprises the following steps:
S1. frequency-changeable compressor (1) is according to the frequency operation of setting, and after available machine time T is set in frequency-changeable compressor (1) operation, frequency-changeable compressor (1) is shut down;
S2. frequency-changeable compressor (1) is set and after K, is started shooting in wait downtime;
S3. frequency conversion plate (2) calculates setting Homes Using TV N, sets Homes Using TV N=T/T+K;
S4. frequency-changeable compressor (1) actual motion, frequency-changeable compressor (1) shutdown after the actual available machine time t of frequency-changeable compressor (1) operation; Frequency-changeable compressor (1) is started shooting after k in wait actual downtime, and frequency conversion plate (2) calculates actual Homes Using TV n, actual Homes Using TV n=t/t+k;
S5. set Homes Using TV N and actual Homes Using TV n comparison, if actual Homes Using TV n is less than, set Homes Using TV N, frequency-changeable compressor (1) reduces running frequency next time, reduces the rotating speed of frequency-changeable compressor (1);
If actual Homes Using TV n is greater than, set Homes Using TV N, the refrigerating capacity that is judged to be frequency-changeable compressor (1) is not enough, in the running frequency of the raising frequency-changeable compressor in service (1) of upper once frequency-changeable compressor (1), improves the rotating speed of frequency-changeable compressor (1).
2. the control method for frequency of frequency conversion refrigerator according to claim 1, is characterized in that: in described step S5, if the temperature of a chamber has reached the requirement of design temperature, frequency-changeable compressor (1) is shut down.
3. the control method for frequency of frequency conversion refrigerator according to claim 1, is characterized in that: in described step S5, frequency-changeable compressor (1) runs to forced stoppage after the longest setting K downtime.
4. the control method for frequency of frequency conversion refrigerator according to claim 1 and 2, is characterized in that: wait for that the temperature in refrigerator arrives the requirement of design temperature, frequency-changeable compressor (1) is waited for setting and after K, started shooting again downtime.
5. according to the control method for frequency of the frequency conversion refrigerator described in claim 1 or 3, it is characterized in that: described setting K downtime is by the program setting of frequency-changeable compressor (1).
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